JP2574032Y2 - Hydraulic pump integrated squeeze-off tool - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeeze-off tool for temporarily compressing and crushing a pipe such as a gas pipe made of an elastic material such as a polyethylene pipe to cut off fluid such as gas. In particular, it relates to a hydraulic pump integrated squeeze-off tool provided integrally with a hydraulic pump.

[0002]

2. Description of the Related Art When a part of a pipe body such as a gas pipe needs repair, a temporary fluid shut-off operation of compressing the area around the part with a squeeze-off tool is performed. In this case, it is necessary to reliably shut off the fluid, not to crush the tube more than necessary, and to completely restore the compressed tube after repairing the tube. There are various types of such squeeze-off tools. The squeeze bar is sandwiched between steel bars or steel pipes, and the movable squeeze bar is fixed to a screw shaft. A squeeze tool and a hydraulic pump are separated from each other, such as a manual squeeze-off tool such as a vise that compresses by screwing with a handle, and a “squeeze tool for resin pipe” disclosed in Japanese Utility Model Publication No. 63-25429. At the work site, a hydraulic squeeze tool that performs a work by connecting a hydraulic pump to a movable squeeze bar each time is employed.

[0003]

However, the manual squeeze-off tool requires a great deal of labor to move the movable squeeze bar by human power. That is, although the tube is formed of an elastic body, it has relatively high rigidity and requires a large force to completely shut off the fluid. Therefore, there is a problem that the manual type requires labor as described above and has poor workability. In addition, the one disclosed in Japanese Utility Model Publication No. 63-25429 has a separate hydraulic pump, which is used to hold the squeeze-off tool and to operate the pump to monitor the compression of the pipe and to prevent the return of the compression. Requires two workers,
In the case of squeezing a buried pipe, there is a problem that the convenience and workability are particularly poor.

[0004] The present invention solves the above-mentioned problems, has good workability and operability, can save labor, and is applied to pipes of various sizes to ensure reliable compression and maintenance of a compressed closed state. It is an object of the present invention to provide a hydraulic pump integrated squeeze-off tool that can be used.

[0005]

In order to achieve the above object, the present invention comprises a hydraulic pump section and a head section connected to the hydraulic pump section via a cylinder mechanism section, wherein the head section is compressed. A fixed squeeze bar that supports the pipe that is
The movable squeeze bar includes a movable squeeze bar connected to the cylinder mechanism, a guide mechanism for holding the tube at a predetermined position, and a stopper for regulating a compression thickness of the tube. A hydraulic pump integrated squeeze-off tool movably supported and arranged at a position facing the fixed squeeze bar and having a plurality of steps formed facing the moving direction, A hydraulic pump-integrated squeeze-off tool having a lock mechanism for maintaining the movable squeeze bar at a compressed thickness position of the tubular body; and furthermore, the head is provided in an axial direction of the hydraulic pump. A hydraulic pump-integrated squeeze-off tool that is rotatably connected to the center of the cylinder and rotatable up and down in the axial direction. It proposes a hydraulic pump integrated squeeze off tool is interposed.

[0006]

The head is placed over a tube that needs to be compressed and closed, and the tube is guided and held by a guide mechanism, and the tube is inserted and positioned between a fixed squeeze bar and a movable squeeze bar. The hydraulic pump is operated, the movable squeeze bar is moved to the fixed squeeze bar side by the cylinder mechanism, and the tube is held between the two squeeze bars. The oil supply by the hydraulic pump is continued, and the movable squeeze bar is advanced until the stopper comes into contact with the fixed squeeze bar. At the forward end, the movable squeeze bar is held by the lock mechanism. In order to return the tube to its original state, after the lock mechanism is released, the pressing force of the hydraulic pump is removed and the tube returns to its original state by the elastic force of the tube.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a squeeze-off tool for compressing a polyethylene pipe to block a gas flow according to the present invention. 1 is a partial longitudinal sectional view showing the overall schematic structure of the present embodiment, FIG. 2 is a perspective view showing an embodiment of a stopper, FIGS. 3 and 4 are separated longitudinal sectional views showing the detailed structure of the present embodiment, 5 and 6 are separated horizontal sectional views of the present embodiment, and FIGS. 7 and 8 are partial side views for explaining a compression operation according to the present embodiment.

As shown in FIG. 1, a squeeze-off tool 1 integrated with a hydraulic pump according to this embodiment comprises a hydraulic pump section 2, a cylinder mechanism section 3, a head section 4 and the like.
The head section 4 has a fixed squeeze bar 5, a movable squeeze bar 6 connected to the cylinder mechanism section 3, a guide mechanism section 7 for holding a tube 10 made of a polyethylene tube, and a single unit structure shown in FIG. And a lock mechanism 9 for holding the movable squeeze bar 6 at a predetermined position.

First, the hydraulic pump section 2 will be described mainly with reference to FIGS. An oil tank 12 for storing hydraulic oil is provided in the elongated fixed handle 11, and the oil tank 12 is fixed to a body 14 by an O-ring 15. A grip 13 for gripping is inserted into the rear end of the fixed handle 11, and the distal end is connected to the body 14 by screwing means. The ram 1 is located almost in the center of the body 14.
A ram chamber 16 for accommodating 6A is provided along the vertical direction in the figure, and a pressure handle 17 is pin-connected to the ram 16A. A joint 18 is screwed to the body 14, and a cylinder head 19 rotatably screwed to the joint 18 is connected. As shown in FIG. 6, an oil chamber 20 and an oil passage 21 connected to the oil chamber 20 are formed in the cylinder head 19. As shown in FIG. 4, a suction valve 22 formed of a ball and a spring communicating the ram chamber 16 with the oil tank 12 and a ball communicating the ram chamber 16 with the oil chamber 20 are provided in the body 14. And a discharge valve 23 composed of a spring. On the other hand, as shown in FIG. 6, a return valve 24 also serving as an oil passage is provided in the body 14 along a direction orthogonal to the ram chamber 16, and a ball valve 25, a pressing pin 26 and the like are provided inside. Also, the return valve 24
An oil passage 27 and an oil passage 28 are provided between the oil tank 12 and the oil chamber 20. Further, as shown in FIG. 6, an oil passage 29 communicating with the ram chamber 16 and an oil tank 12 are provided.
A relief valve 30 is interposed between them. The return lever 31 is connected to the pressing pin 26. On the other hand, as shown in FIG. 4, the joint 18 is provided with a pair of set screws 32 facing each other, and a pair of grooved pins 33 (FIG. 6) on the cylinder head 19 side so as to be able to abut the set screws 32. Driven. With the above structure, the cylinder head 19 is moved about 1
It can rotate by 80 °.

When the pressure handle 17 is swung, the ram 16
A moves up and down. As a result, hydraulic oil in the oil tank 12 is sucked into the ram chamber 16 by the suction valve 22, and the oil chamber 20 of the cylinder head 19 and the oil passage 21 are discharged through the discharge valve 23.
And sent to the cylinder chamber 39 side. On the other hand, when the return lever 31 is pressed and the pressing pin 26 is moved downward to release the ball 25 of the return valve 24, the oil chamber 20 of the cylinder head 19 is opened.
Hydraulic oil in the tank passes from the oil passage 28 through the return valve 24,
The oil is returned to the oil tank 12 through the oil passage 27. Further, when the pressure of the hydraulic oil sent from the ram chamber 16 to the oil chamber 20 and the cylinder chamber 39 in the cylinder head 19 rises to a specified value or more, the relief valve 30 is operated, and the pressure hydraulic oil in the ram chamber 16 is actuated. Is returned to the oil tank 12 side to prevent a pressure rise above a specified pressure. In this case, the pressure hydraulic oil on the side of the cylinder chamber 39 such as the oil chamber 20 of the cylinder head 19 keeps a constant specified pressure without moving to the oil tank, so that the piston 44 described later returns by spring force or the like even during this relief. And maintain the compressed state of the pipe 10.

Next, FIG. 3 and FIG.
This will be described below. The protrusions 19a of the cylinder head 19,
The outer cylinder 3 is fitted in the fitting groove 34 formed between
The five tongues 36 are rotatably fitted and connected. The joint pin 37 includes the protrusions 19a, 19a and the tongue 3
6, and are pin-connected to each other. Joint pin 37
An oil passage 38 is formed therein, and the oil passage 38 communicates with the oil passage 21 on the side of the cylinder head 19 and the outer cylinder 35.
The oil passage 40 communicates with the cylinder chamber 39 side of the oil passage. On the other hand, a plurality of (five in the figure) pin holes 41
Is recessed. The distal end 42a of the positioning pin 42 attached to the protruding portion 19a is adapted to be fitted into the pin hole 41 so as to be able to protrude and retract by a spring action. With the above structure, the outer cylinder 35 rotates around the joint pin 37 in a state where the oil chamber 20 and the cylinder chamber 39 communicate with each other,
The rotation position is specified by the fitting position between the positioning pin 42 and the pin hole 41. The rear end of the inner cylinder 43 is screwed to the outer cylinder 35, and the inner cylinder 4
A piston 44 having an insertion hole 45 provided therein is slidably housed in the axial direction. A return spring 46 is inserted into the insertion hole 45, and a rear end side of the return spring 46 is a spring hook 4 fixed to the inner cylinder 43 side.
7, and the distal end is held by a bolt 48 fixed to the piston 44 at the distal end surface of the insertion hole.

Next, the head unit 4 is shown in FIGS.
This will be described below. A substantially U is provided on the tip side of the inner cylinder 43.
A letter-shaped head 49 is screwed. A fixed squeeze bar 5 having a substantially half-moon cross section serving as a reference support point of the tube body 10 is fixed to the inner surface of the distal end portion of the head 49. On the other hand, a movable squeeze bar 6 having a substantially half-moon cross section is fixed to the distal end side of the piston 44 penetrating the head 49 so as to face the fixed squeeze bar 5. A pair of left and right guide plates 50 is fixed to the upper part of the movable squeeze bar 6 by bolts 51. The guide plate 50 abuts and engages with the guide surface 52 of the head 49 to prevent the movable squeeze bar 6 from rotating in the circumferential direction so that the movable squeeze bar 6 can smoothly move back and forth.

The guide mechanism 7 includes a bolt 53
And a pair of guides 54, 54 fixed in the axial direction of the tube 10 and extending in opposite directions to each other. And a pair of guide plates 56, 56 extending along the direction of movement of the guide plate 56, and one surface side thereof is disposed along the extension direction of the guide plate 56,
The other end is formed of L-shaped guide plates 57, 57 bent in a direction perpendicular to the one surface. A long hole 58 is formed in the L-shaped guide plate 57 along the moving direction of the piston 44, and a left and right guide is provided at a predetermined position corresponding to the diameter of the tube 10 by a thumb screw 68 inserted into the long hole 58. It is fixed to the plate 56 side. During the compression operation, the tube body 10 is held by the fixed squeeze bar 5, the guide plate 56, and the L-shaped guide plate 57 as shown in FIGS. Depending on the diameter of the tube 10, the L-shaped guide plate 57
Is moved along the long hole 58, so that the tube 10 is always accommodated in the head portion 4 in a three-point support type.

Next, the stopper 8 will be described mainly with reference to FIGS. The stopper 8 is mounted on the movable squeeze bar 6 at a vertical position as shown in FIG.
It is supported rotatably about the support shaft 59. As shown in FIG. 2, a plurality of steps 61 (three positions in the drawing) are formed on the surface opposite to the mounting surface 60. Each step portion 61a from the mounting surface 60, 61b, to 61c height a _1, a _2, a _3, respectively to display phase in cradling, dimensions, etc. This tube 1
It is formed corresponding to a crushing thickness of 0. Further, the rotation positioning of the stopper 8 is performed by forming a recess 69 in the mounting surface 60 and providing a ball plunger 70 on the movable squeeze bar 6 side.
By embedding and engaging each other. On the other hand, as shown in FIG. 3, a step 61 of the stopper 8 which is mounted by abutting the mounting surface 60 on the movable squeeze bar 6.
On the side of the fixed squeeze bar 5 opposite to the above, there is formed a contact surface 62 with which the stepped portion 61 comes into contact.

Next, the lock mechanism 9 will be described with reference to FIG. The stud bolt 63 is inserted into a pair of upper and lower through holes 64 that penetrate the head 49 of the head portion 4 along the axial direction with the piston 44 interposed therebetween, and form threaded portions 65 and 66 at both ends. The screw portion 65 on the distal end side is screwed to the movable squeeze bar 6. When the movable squeeze bar 6 is not fixed at a predetermined position, a lock nut 6
7 are screwed together, and the screw portion 66 on the other end is held in a free state. On the other hand, when the movable squeeze bar 6 is locked as described later, the lock nut 6 is attached to the screw portion 66 on the other end side.
7 is screwed, and the lock nut 67 is pressed against the inner surface of the head 49 to restrict the movable squeeze bar 6 from retreating.

Next, the operation of this embodiment will be described mainly with reference to FIGS.
This will be described with reference to FIG. Adjusting the position of the guide plate 56 and the L-shaped guide plate 57 of the guide mechanism 7 based on the diameter of the tube 10 and rotating the stopper 8 to make the step 61 match the crushing size of the tube 10 Is selected. The lock nut 67 of the lock mechanism 9 is a stat bolt 63
To the screw portion 65 on the movable squeeze bar 6 side. Next, the cylinder head 19 is moved one by one according to the installation position of the pipe body 10.
The outer cylinder 35 is rotated around the joint pin 37 while rotating within the range of 80 °, and the position of the pin hole 41 is moved to a desired position and fixed by the positioning pin 42. When the above-mentioned setup work is completed, the head portion 4 is put over the tube body 10 and engaged as shown in FIGS. 1, 3 and 7. As shown in FIG. 7, the tube body 10 contacts the arc-shaped contact surface 5a of the fixed squeeze bar 5 at a point A, contacts a pair of guide plates 56 at a point B, and connects a pair of L-shaped guide plates 57 to a point C. Contact with
That is, the pipe body 10 is held at a predetermined position at a total of five points in a three-point format of A, B, and C, and the squeeze-off tool 1 also contacts the pipe body 10 at five points. Of the squeeze-off tool 1 in the axial direction of the
Work can be performed in a stable state. Next, the pressurizing handle 17 of the hydraulic pump unit 2 is swung to move the oil tank 12
The oil inside is sent to the oil chamber 20 and the oil passage 21 side of the cylinder head 19 via the suction valve 22 and the discharge valve 23. Oilway 2
The oil entering 1 enters the oil passage 38 of the joint pin 37 shown in FIG. 5 and the like, is introduced from the oil passage 40 into the cylinder chamber 39, and advances the piston 44 against the spring force of the return spring 46. Since the movable squeeze bar 6 is connected to the piston 44, the movable squeeze bar 6 moves in the direction of the fixed squeeze bar 5 and presses the tube 10. In this case, the guide plate 50 fixed to the movable squeeze bar 6 is guided by the guide surface 52, and the movement of the movable squeeze bar 6 is facilitated. As shown in FIG. 8, the compression of the tubular body 10 ends at the position where the step 61 of the stopper 8 fixed to the movable squeeze bar 6 collides with the contact surface 62 of the fixed squeeze bar 5. Next, the lock nut 67 of the lock mechanism section 9 is removed from the screw section 65 side, screwed to the screw section 66 side, and the end face of the lock nut 67 is brought into contact with the head 49. As described above, the movable squeeze bar 6 is fixed to the predetermined position by the stud bolt 63 and the lock nut 67, and the retreat is restricted. Following the compression blockage of the tube 10, predetermined repair work is performed. Note that the movable squeeze bar 6 is held at a predetermined position by the lock mechanism 9 even during the repair work for a long period of time, so that the tubular body 10 maintains a constant compressed thickness shown in FIG. 8 during the repair work.

Next, the returning operation of the tube 10 will be described. The lock nut 67 is removed from the screw portion 66 side and screwed on the screw portion 65 side to release the restraint of the movable squeeze bar 6.
The return lever 31 shown in FIG.
7 is communicated. Thereby, the operating oil in the cylinder chamber 39 is returned to the oil tank 12 side. The return spring 46 in the inner cylinder 43 promotes the return of the piston 44. Thus, the movable squeeze bar 6 is retracted. Since the tube body 10 is formed of an elastic body, when the pressing force of the movable squeeze bar 6 is released, the tube body 10 naturally returns to the original state by the elastic force. The predetermined operation is completed by removing the head unit 4 from the tube 10.

As described above, according to the squeeze-off tool of this embodiment, the hydraulic pump unit 2 and the head unit 4 and the like have an integral structure, and the head unit 4 is formed in a rotatable structure. Good nature. In addition, since the guide mechanism 7 and the stopper 8 can be adjusted according to the diameter of the tube 10, the compression and closing of the tube 10 of various dimensions can be performed by one squeeze-off tool.

[0019]

According to the present invention, the following remarkable effects are obtained. (1) Since the hydraulic pump unit, the cylinder mechanism unit, the head unit, and the like are integrated into a single structure, the operability is good, and the squeeze-off operation of the tube is easily and efficiently performed. (2) It is not necessary to connect the hydraulic pressure source and the main body side each time the device is used, so that convenience is improved. (3) Since an integrated hydraulic pump is used, labor can be saved. (4) By providing a stopper that can easily cope with the dimensions of various pipes by rotating, pipes of various shapes and dimensions can be squeezed off with a single tool. As a result, equipment costs can be reduced. Also, the use of the stopper prevents over-compression. (5) The provision of the lock mechanism prevents a reduction in the pressing force due to the retreat of the movable portion due to oil leakage or the like during long-term use. (6) Since the head portion has a rotatable structure, the head portion can be easily engaged with the tube in accordance with the buried state of the tube,
Workability is improved. (7) Since the head portion is formed in a U-shape and the guide mechanism portion is provided, it can be easily engaged with the tube and can stably support the tube at a predetermined position. (8) A state in which the compressed state of the pipe is maintained even if the hydraulic oil in the hydraulic circuit rises above a specified pressure by interposing the relief valve between the oil passage communicating with the ram chamber and the oil tank. To release the excess pressure.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the entire structure of an embodiment of the present invention.

FIG. 2 is a perspective view of a stopper according to the embodiment.

FIG. 3 is an enlarged partial longitudinal sectional view showing a head section and a cylinder mechanism section of the embodiment.

FIG. 4 is an enlarged partial longitudinal sectional view showing the periphery of a hydraulic pump section of the embodiment.

FIG. 5 is an enlarged partial horizontal sectional view showing a head section and a cylinder mechanism section of the embodiment.

FIG. 6 is an enlarged partial horizontal sectional view showing the periphery of a hydraulic pump section according to the embodiment.

FIG. 7 is an explanatory partial side view illustrating the operation of the present embodiment.

FIG. 8 is an explanatory partial side view showing a compressed state of the tube according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic pump integrated squeeze-off tool 2 Hydraulic pump part 3 Cylinder mechanism part 4 Head part 5 Fixed squeeze bar 5a Contact surface 6 Movable squeeze bar 7 Guide mechanism part 8 Stopper 9 Lock mechanism part 10 Tube 11 Fixed handle 12 Oil Tank 13 Grip 14 Body 15 O-ring 16 Ram chamber 16A Ram 17 Pressure handle 18 Joint 19 Cylinder head 19a Projection 20 Oil chamber 21 Oil passage 22 Suction valve 23 Discharge valve 24 Return valve 25 Ball 26 Press pin 27 Oil passage 28 Oil Path 29 Oil path 30 Relief valve 31 Return lever 32 Set screw 33 Pin with groove 34 Fitting groove 35 Outer cylinder 36 Tongue 37 Joint pin 38 Oil path 39 Cylinder chamber 40 Oil path 41 Pin hole 42 Positioning pin 43 Inner cylinder 44 Piston 4 5 Insertion hole 46 Return spring 47 Spring hook 48 Bolt 49 Head 50 Guide plate 51 Bolt 52 Guide surface 53 Bolt 54 Guide 55 Bolt 56 Guide plate 57 L-shaped guide plate 58 Long hole 59 Support shaft 60 Mounting surface 61 Step 61a Step 61b Step 61c Step 62 Contact surface 63 Stud bolt 64 Through hole 65 Screw 66 Screw 67 Lock nut 68 Thumb screw

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroyuki Watanabe 3039 Sasaga, Matsumoto-shi, Nagano Pref. Izumi Seiki Seisakusho Co., Ltd. (56) Reference Reference -50673 (JP, U) Jikken 52-12137 (JP, Y2) Jikgyo 2-25038 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B25B 1/18 B30B 1/32 B30B 12/00 F16L 55/10

Claims (4)

(57) [Scope of request for utility model registration] 1. A hydraulic pump unit, comprising: a head unit connected to the hydraulic pump unit via a cylinder mechanism unit; the head unit comprising: a fixed squeeze bar for supporting a tube to be compressed;
The movable squeeze bar includes a movable squeeze bar connected to the cylinder mechanism, a guide mechanism for holding the tube at a predetermined position, and a stopper for regulating a compression thickness of the tube. A hydraulic type, comprising a plurality of steps movably supported and disposed at positions facing the fixed squeeze bar, and a plurality of steps facing the moving direction of the movable squeeze bar are formed. Pump integrated squeeze-off tool. 2. A squeeze integrated with a hydraulic pump according to claim 1 , wherein the head has a lock mechanism for holding the movable squeeze bar to the compressed thickness of the tube. Off tool. Wherein said head portion, said rotatable about the axial direction of the hydraulic pump unit, and, according to claim 1 or claim characterized in that it is pivotally connected to the upper and lower axial 2
2. A squeeze-off tool integrated with a hydraulic pump according to item 1. 4. The relief valve according to claim 1, wherein the relief valve is provided in a hydraulic circuit between the ram chamber and the oil tank.
Hydraulic pump integrated squeeze off tool according to any one of claims 3.